EXPLAINER: What might Colorado River cuts mean for states?

The Biden administration floated two ideas this week to reduce water usage from the dwindling Colorado River, which supplies 40 million people.

The 1,450-mile (2,334-kilometer) river is a lifeline for seven U.S. states, dozens of Native American tribes, and two states in Mexico. It irrigates nearly 5.5 million acres (about 2.2 million hectares) of farmland in the U.S. and Mexico and generates hydroelectric power used across the West.

In recent decades, drought, climate change and an imbalance between the river's flows and how much water users are promised has forced federal officials to consider new steps.

Tuesday's analysis from the Interior Department considers two ways to force cuts in the water supply for Arizona, Nevada and California: use the existing water priority system or the same percentage across the board. California and some tribes with senior rights to water benefit more under the first option. Arizona and Nevada, largely with junior rights, don't feel as much pain under the second.

Federal officials haven't taken a stance.